Simple Terrain path/mound

 

start by creating a grid for the terrain 

Then use a group create and enable bounding box - Select the area where you want the path/mound.

split the path so you can edit it to look like a mound.

create an attribute adjust float - attribute name: bbox - operation: set always - pattern type: bounding box

Then create an attribute wrangle - vex: @P.y += chramp('remap', @bbox) * chf("threshold"); - this will take the Y position and allow you to adjust its shape - the threshold then lets you adjust the stremgth 

merge the rest of the grid back to the edited area - add a mountain to build the rest of the terrain shape 

                                                                         

result